2024939_en-US

[#1]

FRDM-MCXN947: Detection of Disconnection of USB1_HS

Hi,

I would like to ask, on the FRDM-MCXN947 board I am using USB1_HS with OTG USB, I am trying to detect the connection and disconnection of this USB. Connection detection works fine, so I use this function:

usb_device_notification_t USB_State(usb_device_struct_t *pDeviceHandle)
{
	usb_device_ehci_state_struct_t *ehciState;
	ehciState = (usb_device_ehci_state_struct_t *)(pDeviceHandle->controllerHandle);

	if (0U != (ehciState->registerBase->OTGSC & USBHS_OTGSC_BSV_MASK))
    {
		return kUSB_DeviceNotifyAttach;
    }
	return kUSB_DeviceNotifyDetach;
}

However, for some reason this USB OTG register does not detect the disconnection correctly. Is it possible to use some other register to detect the disconnection?

Thank you for any advise!

John Adams

MCXNRe: FRDM-MCXN947: Detection of Disconnection of USB1_HS

Hi @John_Adams,

Please refer to the following community post on how to enable the detach detection: What is the best way to detect attaching and detaching of an usb cable between RT1020 (device) and a...

It is referring an RT1020, but it is the same process for the MCXN947.

BR,
Edwin.